困难多的

Their difficulties are increasing.

他们的困难多。

The times of chirospasm became more and more, my speaking became more and more lisping and swallowing also became the biggest difficulty.

手痉挛的次数多，说话变得含糊，吞咽成为最大的困难。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组中酚类、黄酮类等次生代谢物较多，要从中提纯度的DNA比较困难。